I did a test yesterday with 8 tracks of drums using the multitrack quantizing method that’s described in the manual and it worked without a hitch. I don’t quantize much and am far from an expert on hitpoints so I’m a little fuzzy on the differences between you method and the method I used which was…
Analyze the kik snare and overheads, group all the tracks, click the quantize window and cut, quantize and crossfade the tracks.